HYDROCRACKING OF N-DECANE OVER ZEOLITE-SUPPORTED METAL SULFIDE CATALYSTS .2. ZEOLITE Y-SUPPORTED NI AND NI-MO SULFIDES

For zeolite Y-supported nickel sulfide catalysts the influence of the metal sulfide dispersion on the hydrocracking properties for n-decane is examined. In order to obtain different nickel sulfide distributions (inside or outside the zeolite structure) and dispersions, the prepar ation method (impregnation of CaY or ion exchange of NaY), sulfidation procedure (direct sulfidation or sulfidation after drying), and metal loading are varied. A higher nickel sulfide surface (as measured by d ynamic oxygen chemisorption) results in a strong increase of the n-dec ane conversion, but this is not accompanied by an improvement of the c atalytic properties toward ideal hydrocracking. Additionally, some zeo lite Y-supported Ni-Mo sulfide catalysts (varying in preparation metho d and sulfidation procedure) are tested for the hydroconversion of n-d ecane. However, no promoter effect could be observed. The activity of the bimetallic sulfide catalysts is always almost equal to that of the most active monometallic sulfide constituent.